” a new Garmin GPSMAP 722 connected to the S2 autopilot with NMEA 183 (TXA to NMEA IN+, and TXB to NMEA IN-) “=====you maybe need try swapping these two wires to see any joy.
Regarding the wind speed and other values issue, it doesn’t look like the communication issue. Can you check your OpenCPN setting please.